1 /*
2 * generic functions used by VFIO devices
3 *
4 * Copyright Red Hat, Inc. 2012
5 *
6 * Authors:
7 * Alex Williamson <alex.williamson@redhat.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 * Based on qemu-kvm device-assignment:
13 * Adapted for KVM by Qumranet.
14 * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com)
15 * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com)
16 * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com)
17 * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com)
18 * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com)
19 */
20
21 #include "qemu/osdep.h"
22 #include <sys/ioctl.h>
23 #ifdef CONFIG_KVM
24 #include <linux/kvm.h>
25 #endif
26 #include <linux/vfio.h>
27
28 #include "hw/vfio/vfio-common.h"
29 #include "hw/vfio/pci.h"
30 #include "exec/address-spaces.h"
31 #include "exec/memory.h"
32 #include "exec/ram_addr.h"
33 #include "hw/hw.h"
34 #include "qemu/error-report.h"
35 #include "qemu/main-loop.h"
36 #include "qemu/range.h"
37 #include "sysemu/kvm.h"
38 #include "sysemu/reset.h"
39 #include "sysemu/runstate.h"
40 #include "trace.h"
41 #include "qapi/error.h"
42 #include "migration/misc.h"
43 #include "migration/blocker.h"
44 #include "migration/qemu-file.h"
45 #include "sysemu/tpm.h"
46
47 VFIODeviceList vfio_device_list =
48 QLIST_HEAD_INITIALIZER(vfio_device_list);
49 static QLIST_HEAD(, VFIOAddressSpace) vfio_address_spaces =
50 QLIST_HEAD_INITIALIZER(vfio_address_spaces);
51
52 #ifdef CONFIG_KVM
53 /*
54 * We have a single VFIO pseudo device per KVM VM. Once created it lives
55 * for the life of the VM. Closing the file descriptor only drops our
56 * reference to it and the device's reference to kvm. Therefore once
57 * initialized, this file descriptor is only released on QEMU exit and
58 * we'll re-use it should another vfio device be attached before then.
59 */
60 int vfio_kvm_device_fd = -1;
61 #endif
62
63 /*
64 * Device state interfaces
65 */
66
vfio_mig_active(void)67 bool vfio_mig_active(void)
68 {
69 VFIODevice *vbasedev;
70
71 if (QLIST_EMPTY(&vfio_device_list)) {
72 return false;
73 }
74
75 QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
76 if (vbasedev->migration_blocker) {
77 return false;
78 }
79 }
80 return true;
81 }
82
83 static Error *multiple_devices_migration_blocker;
84
85 /*
86 * Multiple devices migration is allowed only if all devices support P2P
87 * migration. Single device migration is allowed regardless of P2P migration
88 * support.
89 */
vfio_multiple_devices_migration_is_supported(void)90 static bool vfio_multiple_devices_migration_is_supported(void)
91 {
92 VFIODevice *vbasedev;
93 unsigned int device_num = 0;
94 bool all_support_p2p = true;
95
96 QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
97 if (vbasedev->migration) {
98 device_num++;
99
100 if (!(vbasedev->migration->mig_flags & VFIO_MIGRATION_P2P)) {
101 all_support_p2p = false;
102 }
103 }
104 }
105
106 return all_support_p2p || device_num <= 1;
107 }
108
vfio_block_multiple_devices_migration(VFIODevice * vbasedev,Error ** errp)109 int vfio_block_multiple_devices_migration(VFIODevice *vbasedev, Error **errp)
110 {
111 int ret;
112
113 if (vfio_multiple_devices_migration_is_supported()) {
114 return 0;
115 }
116
117 if (vbasedev->enable_migration == ON_OFF_AUTO_ON) {
118 error_setg(errp, "Multiple VFIO devices migration is supported only if "
119 "all of them support P2P migration");
120 return -EINVAL;
121 }
122
123 if (multiple_devices_migration_blocker) {
124 return 0;
125 }
126
127 error_setg(&multiple_devices_migration_blocker,
128 "Multiple VFIO devices migration is supported only if all of "
129 "them support P2P migration");
130 ret = migrate_add_blocker_normal(&multiple_devices_migration_blocker, errp);
131
132 return ret;
133 }
134
vfio_unblock_multiple_devices_migration(void)135 void vfio_unblock_multiple_devices_migration(void)
136 {
137 if (!multiple_devices_migration_blocker ||
138 !vfio_multiple_devices_migration_is_supported()) {
139 return;
140 }
141
142 migrate_del_blocker(&multiple_devices_migration_blocker);
143 }
144
vfio_viommu_preset(VFIODevice * vbasedev)145 bool vfio_viommu_preset(VFIODevice *vbasedev)
146 {
147 return vbasedev->bcontainer->space->as != &address_space_memory;
148 }
149
vfio_set_migration_error(int ret)150 static void vfio_set_migration_error(int ret)
151 {
152 if (migration_is_running()) {
153 migration_file_set_error(ret, NULL);
154 }
155 }
156
vfio_device_state_is_running(VFIODevice * vbasedev)157 bool vfio_device_state_is_running(VFIODevice *vbasedev)
158 {
159 VFIOMigration *migration = vbasedev->migration;
160
161 return migration->device_state == VFIO_DEVICE_STATE_RUNNING ||
162 migration->device_state == VFIO_DEVICE_STATE_RUNNING_P2P;
163 }
164
vfio_device_state_is_precopy(VFIODevice * vbasedev)165 bool vfio_device_state_is_precopy(VFIODevice *vbasedev)
166 {
167 VFIOMigration *migration = vbasedev->migration;
168
169 return migration->device_state == VFIO_DEVICE_STATE_PRE_COPY ||
170 migration->device_state == VFIO_DEVICE_STATE_PRE_COPY_P2P;
171 }
172
vfio_devices_all_dirty_tracking(VFIOContainerBase * bcontainer)173 static bool vfio_devices_all_dirty_tracking(VFIOContainerBase *bcontainer)
174 {
175 VFIODevice *vbasedev;
176
177 if (!migration_is_active() && !migration_is_device()) {
178 return false;
179 }
180
181 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
182 VFIOMigration *migration = vbasedev->migration;
183
184 if (!migration) {
185 return false;
186 }
187
188 if (vbasedev->pre_copy_dirty_page_tracking == ON_OFF_AUTO_OFF &&
189 (vfio_device_state_is_running(vbasedev) ||
190 vfio_device_state_is_precopy(vbasedev))) {
191 return false;
192 }
193 }
194 return true;
195 }
196
vfio_devices_all_device_dirty_tracking(const VFIOContainerBase * bcontainer)197 bool vfio_devices_all_device_dirty_tracking(const VFIOContainerBase *bcontainer)
198 {
199 VFIODevice *vbasedev;
200
201 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
202 if (vbasedev->device_dirty_page_tracking == ON_OFF_AUTO_OFF) {
203 return false;
204 }
205 if (!vbasedev->dirty_pages_supported) {
206 return false;
207 }
208 }
209
210 return true;
211 }
212
213 /*
214 * Check if all VFIO devices are running and migration is active, which is
215 * essentially equivalent to the migration being in pre-copy phase.
216 */
217 bool
vfio_devices_all_running_and_mig_active(const VFIOContainerBase * bcontainer)218 vfio_devices_all_running_and_mig_active(const VFIOContainerBase *bcontainer)
219 {
220 VFIODevice *vbasedev;
221
222 if (!migration_is_active()) {
223 return false;
224 }
225
226 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
227 VFIOMigration *migration = vbasedev->migration;
228
229 if (!migration) {
230 return false;
231 }
232
233 if (vfio_device_state_is_running(vbasedev) ||
234 vfio_device_state_is_precopy(vbasedev)) {
235 continue;
236 } else {
237 return false;
238 }
239 }
240 return true;
241 }
242
vfio_listener_skipped_section(MemoryRegionSection * section)243 static bool vfio_listener_skipped_section(MemoryRegionSection *section)
244 {
245 return (!memory_region_is_ram(section->mr) &&
246 !memory_region_is_iommu(section->mr)) ||
247 memory_region_is_protected(section->mr) ||
248 /*
249 * Sizing an enabled 64-bit BAR can cause spurious mappings to
250 * addresses in the upper part of the 64-bit address space. These
251 * are never accessed by the CPU and beyond the address width of
252 * some IOMMU hardware. TODO: VFIO should tell us the IOMMU width.
253 */
254 section->offset_within_address_space & (1ULL << 63);
255 }
256
257 /* Called with rcu_read_lock held. */
vfio_get_xlat_addr(IOMMUTLBEntry * iotlb,void ** vaddr,ram_addr_t * ram_addr,bool * read_only,Error ** errp)258 static bool vfio_get_xlat_addr(IOMMUTLBEntry *iotlb, void **vaddr,
259 ram_addr_t *ram_addr, bool *read_only,
260 Error **errp)
261 {
262 bool ret, mr_has_discard_manager;
263
264 ret = memory_get_xlat_addr(iotlb, vaddr, ram_addr, read_only,
265 &mr_has_discard_manager, errp);
266 if (ret && mr_has_discard_manager) {
267 /*
268 * Malicious VMs might trigger discarding of IOMMU-mapped memory. The
269 * pages will remain pinned inside vfio until unmapped, resulting in a
270 * higher memory consumption than expected. If memory would get
271 * populated again later, there would be an inconsistency between pages
272 * pinned by vfio and pages seen by QEMU. This is the case until
273 * unmapped from the IOMMU (e.g., during device reset).
274 *
275 * With malicious guests, we really only care about pinning more memory
276 * than expected. RLIMIT_MEMLOCK set for the user/process can never be
277 * exceeded and can be used to mitigate this problem.
278 */
279 warn_report_once("Using vfio with vIOMMUs and coordinated discarding of"
280 " RAM (e.g., virtio-mem) works, however, malicious"
281 " guests can trigger pinning of more memory than"
282 " intended via an IOMMU. It's possible to mitigate "
283 " by setting/adjusting RLIMIT_MEMLOCK.");
284 }
285 return ret;
286 }
287
vfio_iommu_map_notify(IOMMUNotifier * n,IOMMUTLBEntry * iotlb)288 static void vfio_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
289 {
290 VFIOGuestIOMMU *giommu = container_of(n, VFIOGuestIOMMU, n);
291 VFIOContainerBase *bcontainer = giommu->bcontainer;
292 hwaddr iova = iotlb->iova + giommu->iommu_offset;
293 void *vaddr;
294 int ret;
295 Error *local_err = NULL;
296
297 trace_vfio_iommu_map_notify(iotlb->perm == IOMMU_NONE ? "UNMAP" : "MAP",
298 iova, iova + iotlb->addr_mask);
299
300 if (iotlb->target_as != &address_space_memory) {
301 error_report("Wrong target AS \"%s\", only system memory is allowed",
302 iotlb->target_as->name ? iotlb->target_as->name : "none");
303 vfio_set_migration_error(-EINVAL);
304 return;
305 }
306
307 rcu_read_lock();
308
309 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) {
310 bool read_only;
311
312 if (!vfio_get_xlat_addr(iotlb, &vaddr, NULL, &read_only, &local_err)) {
313 error_report_err(local_err);
314 goto out;
315 }
316 /*
317 * vaddr is only valid until rcu_read_unlock(). But after
318 * vfio_dma_map has set up the mapping the pages will be
319 * pinned by the kernel. This makes sure that the RAM backend
320 * of vaddr will always be there, even if the memory object is
321 * destroyed and its backing memory munmap-ed.
322 */
323 ret = vfio_container_dma_map(bcontainer, iova,
324 iotlb->addr_mask + 1, vaddr,
325 read_only);
326 if (ret) {
327 error_report("vfio_container_dma_map(%p, 0x%"HWADDR_PRIx", "
328 "0x%"HWADDR_PRIx", %p) = %d (%s)",
329 bcontainer, iova,
330 iotlb->addr_mask + 1, vaddr, ret, strerror(-ret));
331 }
332 } else {
333 ret = vfio_container_dma_unmap(bcontainer, iova,
334 iotlb->addr_mask + 1, iotlb);
335 if (ret) {
336 error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
337 "0x%"HWADDR_PRIx") = %d (%s)",
338 bcontainer, iova,
339 iotlb->addr_mask + 1, ret, strerror(-ret));
340 vfio_set_migration_error(ret);
341 }
342 }
343 out:
344 rcu_read_unlock();
345 }
346
vfio_ram_discard_notify_discard(RamDiscardListener * rdl,MemoryRegionSection * section)347 static void vfio_ram_discard_notify_discard(RamDiscardListener *rdl,
348 MemoryRegionSection *section)
349 {
350 VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener,
351 listener);
352 VFIOContainerBase *bcontainer = vrdl->bcontainer;
353 const hwaddr size = int128_get64(section->size);
354 const hwaddr iova = section->offset_within_address_space;
355 int ret;
356
357 /* Unmap with a single call. */
358 ret = vfio_container_dma_unmap(bcontainer, iova, size , NULL);
359 if (ret) {
360 error_report("%s: vfio_container_dma_unmap() failed: %s", __func__,
361 strerror(-ret));
362 }
363 }
364
vfio_ram_discard_notify_populate(RamDiscardListener * rdl,MemoryRegionSection * section)365 static int vfio_ram_discard_notify_populate(RamDiscardListener *rdl,
366 MemoryRegionSection *section)
367 {
368 VFIORamDiscardListener *vrdl = container_of(rdl, VFIORamDiscardListener,
369 listener);
370 VFIOContainerBase *bcontainer = vrdl->bcontainer;
371 const hwaddr end = section->offset_within_region +
372 int128_get64(section->size);
373 hwaddr start, next, iova;
374 void *vaddr;
375 int ret;
376
377 /*
378 * Map in (aligned within memory region) minimum granularity, so we can
379 * unmap in minimum granularity later.
380 */
381 for (start = section->offset_within_region; start < end; start = next) {
382 next = ROUND_UP(start + 1, vrdl->granularity);
383 next = MIN(next, end);
384
385 iova = start - section->offset_within_region +
386 section->offset_within_address_space;
387 vaddr = memory_region_get_ram_ptr(section->mr) + start;
388
389 ret = vfio_container_dma_map(bcontainer, iova, next - start,
390 vaddr, section->readonly);
391 if (ret) {
392 /* Rollback */
393 vfio_ram_discard_notify_discard(rdl, section);
394 return ret;
395 }
396 }
397 return 0;
398 }
399
vfio_register_ram_discard_listener(VFIOContainerBase * bcontainer,MemoryRegionSection * section)400 static void vfio_register_ram_discard_listener(VFIOContainerBase *bcontainer,
401 MemoryRegionSection *section)
402 {
403 RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr);
404 VFIORamDiscardListener *vrdl;
405
406 /* Ignore some corner cases not relevant in practice. */
407 g_assert(QEMU_IS_ALIGNED(section->offset_within_region, TARGET_PAGE_SIZE));
408 g_assert(QEMU_IS_ALIGNED(section->offset_within_address_space,
409 TARGET_PAGE_SIZE));
410 g_assert(QEMU_IS_ALIGNED(int128_get64(section->size), TARGET_PAGE_SIZE));
411
412 vrdl = g_new0(VFIORamDiscardListener, 1);
413 vrdl->bcontainer = bcontainer;
414 vrdl->mr = section->mr;
415 vrdl->offset_within_address_space = section->offset_within_address_space;
416 vrdl->size = int128_get64(section->size);
417 vrdl->granularity = ram_discard_manager_get_min_granularity(rdm,
418 section->mr);
419
420 g_assert(vrdl->granularity && is_power_of_2(vrdl->granularity));
421 g_assert(bcontainer->pgsizes &&
422 vrdl->granularity >= 1ULL << ctz64(bcontainer->pgsizes));
423
424 ram_discard_listener_init(&vrdl->listener,
425 vfio_ram_discard_notify_populate,
426 vfio_ram_discard_notify_discard, true);
427 ram_discard_manager_register_listener(rdm, &vrdl->listener, section);
428 QLIST_INSERT_HEAD(&bcontainer->vrdl_list, vrdl, next);
429
430 /*
431 * Sanity-check if we have a theoretically problematic setup where we could
432 * exceed the maximum number of possible DMA mappings over time. We assume
433 * that each mapped section in the same address space as a RamDiscardManager
434 * section consumes exactly one DMA mapping, with the exception of
435 * RamDiscardManager sections; i.e., we don't expect to have gIOMMU sections
436 * in the same address space as RamDiscardManager sections.
437 *
438 * We assume that each section in the address space consumes one memslot.
439 * We take the number of KVM memory slots as a best guess for the maximum
440 * number of sections in the address space we could have over time,
441 * also consuming DMA mappings.
442 */
443 if (bcontainer->dma_max_mappings) {
444 unsigned int vrdl_count = 0, vrdl_mappings = 0, max_memslots = 512;
445
446 #ifdef CONFIG_KVM
447 if (kvm_enabled()) {
448 max_memslots = kvm_get_max_memslots();
449 }
450 #endif
451
452 QLIST_FOREACH(vrdl, &bcontainer->vrdl_list, next) {
453 hwaddr start, end;
454
455 start = QEMU_ALIGN_DOWN(vrdl->offset_within_address_space,
456 vrdl->granularity);
457 end = ROUND_UP(vrdl->offset_within_address_space + vrdl->size,
458 vrdl->granularity);
459 vrdl_mappings += (end - start) / vrdl->granularity;
460 vrdl_count++;
461 }
462
463 if (vrdl_mappings + max_memslots - vrdl_count >
464 bcontainer->dma_max_mappings) {
465 warn_report("%s: possibly running out of DMA mappings. E.g., try"
466 " increasing the 'block-size' of virtio-mem devies."
467 " Maximum possible DMA mappings: %d, Maximum possible"
468 " memslots: %d", __func__, bcontainer->dma_max_mappings,
469 max_memslots);
470 }
471 }
472 }
473
vfio_unregister_ram_discard_listener(VFIOContainerBase * bcontainer,MemoryRegionSection * section)474 static void vfio_unregister_ram_discard_listener(VFIOContainerBase *bcontainer,
475 MemoryRegionSection *section)
476 {
477 RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr);
478 VFIORamDiscardListener *vrdl = NULL;
479
480 QLIST_FOREACH(vrdl, &bcontainer->vrdl_list, next) {
481 if (vrdl->mr == section->mr &&
482 vrdl->offset_within_address_space ==
483 section->offset_within_address_space) {
484 break;
485 }
486 }
487
488 if (!vrdl) {
489 hw_error("vfio: Trying to unregister missing RAM discard listener");
490 }
491
492 ram_discard_manager_unregister_listener(rdm, &vrdl->listener);
493 QLIST_REMOVE(vrdl, next);
494 g_free(vrdl);
495 }
496
vfio_known_safe_misalignment(MemoryRegionSection * section)497 static bool vfio_known_safe_misalignment(MemoryRegionSection *section)
498 {
499 MemoryRegion *mr = section->mr;
500
501 if (!TPM_IS_CRB(mr->owner)) {
502 return false;
503 }
504
505 /* this is a known safe misaligned region, just trace for debug purpose */
506 trace_vfio_known_safe_misalignment(memory_region_name(mr),
507 section->offset_within_address_space,
508 section->offset_within_region,
509 qemu_real_host_page_size());
510 return true;
511 }
512
vfio_listener_valid_section(MemoryRegionSection * section,const char * name)513 static bool vfio_listener_valid_section(MemoryRegionSection *section,
514 const char *name)
515 {
516 if (vfio_listener_skipped_section(section)) {
517 trace_vfio_listener_region_skip(name,
518 section->offset_within_address_space,
519 section->offset_within_address_space +
520 int128_get64(int128_sub(section->size, int128_one())));
521 return false;
522 }
523
524 if (unlikely((section->offset_within_address_space &
525 ~qemu_real_host_page_mask()) !=
526 (section->offset_within_region & ~qemu_real_host_page_mask()))) {
527 if (!vfio_known_safe_misalignment(section)) {
528 error_report("%s received unaligned region %s iova=0x%"PRIx64
529 " offset_within_region=0x%"PRIx64
530 " qemu_real_host_page_size=0x%"PRIxPTR,
531 __func__, memory_region_name(section->mr),
532 section->offset_within_address_space,
533 section->offset_within_region,
534 qemu_real_host_page_size());
535 }
536 return false;
537 }
538
539 return true;
540 }
541
vfio_get_section_iova_range(VFIOContainerBase * bcontainer,MemoryRegionSection * section,hwaddr * out_iova,hwaddr * out_end,Int128 * out_llend)542 static bool vfio_get_section_iova_range(VFIOContainerBase *bcontainer,
543 MemoryRegionSection *section,
544 hwaddr *out_iova, hwaddr *out_end,
545 Int128 *out_llend)
546 {
547 Int128 llend;
548 hwaddr iova;
549
550 iova = REAL_HOST_PAGE_ALIGN(section->offset_within_address_space);
551 llend = int128_make64(section->offset_within_address_space);
552 llend = int128_add(llend, section->size);
553 llend = int128_and(llend, int128_exts64(qemu_real_host_page_mask()));
554
555 if (int128_ge(int128_make64(iova), llend)) {
556 return false;
557 }
558
559 *out_iova = iova;
560 *out_end = int128_get64(int128_sub(llend, int128_one()));
561 if (out_llend) {
562 *out_llend = llend;
563 }
564 return true;
565 }
566
vfio_listener_region_add(MemoryListener * listener,MemoryRegionSection * section)567 static void vfio_listener_region_add(MemoryListener *listener,
568 MemoryRegionSection *section)
569 {
570 VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
571 listener);
572 hwaddr iova, end;
573 Int128 llend, llsize;
574 void *vaddr;
575 int ret;
576 Error *err = NULL;
577
578 if (!vfio_listener_valid_section(section, "region_add")) {
579 return;
580 }
581
582 if (!vfio_get_section_iova_range(bcontainer, section, &iova, &end,
583 &llend)) {
584 if (memory_region_is_ram_device(section->mr)) {
585 trace_vfio_listener_region_add_no_dma_map(
586 memory_region_name(section->mr),
587 section->offset_within_address_space,
588 int128_getlo(section->size),
589 qemu_real_host_page_size());
590 }
591 return;
592 }
593
594 if (!vfio_container_add_section_window(bcontainer, section, &err)) {
595 goto fail;
596 }
597
598 memory_region_ref(section->mr);
599
600 if (memory_region_is_iommu(section->mr)) {
601 VFIOGuestIOMMU *giommu;
602 IOMMUMemoryRegion *iommu_mr = IOMMU_MEMORY_REGION(section->mr);
603 int iommu_idx;
604
605 trace_vfio_listener_region_add_iommu(section->mr->name, iova, end);
606 /*
607 * FIXME: For VFIO iommu types which have KVM acceleration to
608 * avoid bouncing all map/unmaps through qemu this way, this
609 * would be the right place to wire that up (tell the KVM
610 * device emulation the VFIO iommu handles to use).
611 */
612 giommu = g_malloc0(sizeof(*giommu));
613 giommu->iommu_mr = iommu_mr;
614 giommu->iommu_offset = section->offset_within_address_space -
615 section->offset_within_region;
616 giommu->bcontainer = bcontainer;
617 llend = int128_add(int128_make64(section->offset_within_region),
618 section->size);
619 llend = int128_sub(llend, int128_one());
620 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
621 MEMTXATTRS_UNSPECIFIED);
622 iommu_notifier_init(&giommu->n, vfio_iommu_map_notify,
623 IOMMU_NOTIFIER_IOTLB_EVENTS,
624 section->offset_within_region,
625 int128_get64(llend),
626 iommu_idx);
627
628 ret = memory_region_register_iommu_notifier(section->mr, &giommu->n,
629 &err);
630 if (ret) {
631 g_free(giommu);
632 goto fail;
633 }
634 QLIST_INSERT_HEAD(&bcontainer->giommu_list, giommu, giommu_next);
635 memory_region_iommu_replay(giommu->iommu_mr, &giommu->n);
636
637 return;
638 }
639
640 /* Here we assume that memory_region_is_ram(section->mr)==true */
641
642 /*
643 * For RAM memory regions with a RamDiscardManager, we only want to map the
644 * actually populated parts - and update the mapping whenever we're notified
645 * about changes.
646 */
647 if (memory_region_has_ram_discard_manager(section->mr)) {
648 vfio_register_ram_discard_listener(bcontainer, section);
649 return;
650 }
651
652 vaddr = memory_region_get_ram_ptr(section->mr) +
653 section->offset_within_region +
654 (iova - section->offset_within_address_space);
655
656 trace_vfio_listener_region_add_ram(iova, end, vaddr);
657
658 llsize = int128_sub(llend, int128_make64(iova));
659
660 if (memory_region_is_ram_device(section->mr)) {
661 hwaddr pgmask = (1ULL << ctz64(bcontainer->pgsizes)) - 1;
662
663 if ((iova & pgmask) || (int128_get64(llsize) & pgmask)) {
664 trace_vfio_listener_region_add_no_dma_map(
665 memory_region_name(section->mr),
666 section->offset_within_address_space,
667 int128_getlo(section->size),
668 pgmask + 1);
669 return;
670 }
671 }
672
673 ret = vfio_container_dma_map(bcontainer, iova, int128_get64(llsize),
674 vaddr, section->readonly);
675 if (ret) {
676 error_setg(&err, "vfio_container_dma_map(%p, 0x%"HWADDR_PRIx", "
677 "0x%"HWADDR_PRIx", %p) = %d (%s)",
678 bcontainer, iova, int128_get64(llsize), vaddr, ret,
679 strerror(-ret));
680 if (memory_region_is_ram_device(section->mr)) {
681 /* Allow unexpected mappings not to be fatal for RAM devices */
682 error_report_err(err);
683 return;
684 }
685 goto fail;
686 }
687
688 return;
689
690 fail:
691 if (memory_region_is_ram_device(section->mr)) {
692 error_reportf_err(err, "PCI p2p may not work: ");
693 return;
694 }
695 /*
696 * On the initfn path, store the first error in the container so we
697 * can gracefully fail. Runtime, there's not much we can do other
698 * than throw a hardware error.
699 */
700 if (!bcontainer->initialized) {
701 if (!bcontainer->error) {
702 error_propagate_prepend(&bcontainer->error, err,
703 "Region %s: ",
704 memory_region_name(section->mr));
705 } else {
706 error_free(err);
707 }
708 } else {
709 error_report_err(err);
710 hw_error("vfio: DMA mapping failed, unable to continue");
711 }
712 }
713
vfio_listener_region_del(MemoryListener * listener,MemoryRegionSection * section)714 static void vfio_listener_region_del(MemoryListener *listener,
715 MemoryRegionSection *section)
716 {
717 VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
718 listener);
719 hwaddr iova, end;
720 Int128 llend, llsize;
721 int ret;
722 bool try_unmap = true;
723
724 if (!vfio_listener_valid_section(section, "region_del")) {
725 return;
726 }
727
728 if (memory_region_is_iommu(section->mr)) {
729 VFIOGuestIOMMU *giommu;
730
731 trace_vfio_listener_region_del_iommu(section->mr->name);
732 QLIST_FOREACH(giommu, &bcontainer->giommu_list, giommu_next) {
733 if (MEMORY_REGION(giommu->iommu_mr) == section->mr &&
734 giommu->n.start == section->offset_within_region) {
735 memory_region_unregister_iommu_notifier(section->mr,
736 &giommu->n);
737 QLIST_REMOVE(giommu, giommu_next);
738 g_free(giommu);
739 break;
740 }
741 }
742
743 /*
744 * FIXME: We assume the one big unmap below is adequate to
745 * remove any individual page mappings in the IOMMU which
746 * might have been copied into VFIO. This works for a page table
747 * based IOMMU where a big unmap flattens a large range of IO-PTEs.
748 * That may not be true for all IOMMU types.
749 */
750 }
751
752 if (!vfio_get_section_iova_range(bcontainer, section, &iova, &end,
753 &llend)) {
754 return;
755 }
756
757 llsize = int128_sub(llend, int128_make64(iova));
758
759 trace_vfio_listener_region_del(iova, end);
760
761 if (memory_region_is_ram_device(section->mr)) {
762 hwaddr pgmask;
763
764 pgmask = (1ULL << ctz64(bcontainer->pgsizes)) - 1;
765 try_unmap = !((iova & pgmask) || (int128_get64(llsize) & pgmask));
766 } else if (memory_region_has_ram_discard_manager(section->mr)) {
767 vfio_unregister_ram_discard_listener(bcontainer, section);
768 /* Unregistering will trigger an unmap. */
769 try_unmap = false;
770 }
771
772 if (try_unmap) {
773 if (int128_eq(llsize, int128_2_64())) {
774 /* The unmap ioctl doesn't accept a full 64-bit span. */
775 llsize = int128_rshift(llsize, 1);
776 ret = vfio_container_dma_unmap(bcontainer, iova,
777 int128_get64(llsize), NULL);
778 if (ret) {
779 error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
780 "0x%"HWADDR_PRIx") = %d (%s)",
781 bcontainer, iova, int128_get64(llsize), ret,
782 strerror(-ret));
783 }
784 iova += int128_get64(llsize);
785 }
786 ret = vfio_container_dma_unmap(bcontainer, iova,
787 int128_get64(llsize), NULL);
788 if (ret) {
789 error_report("vfio_container_dma_unmap(%p, 0x%"HWADDR_PRIx", "
790 "0x%"HWADDR_PRIx") = %d (%s)",
791 bcontainer, iova, int128_get64(llsize), ret,
792 strerror(-ret));
793 }
794 }
795
796 memory_region_unref(section->mr);
797
798 vfio_container_del_section_window(bcontainer, section);
799 }
800
801 typedef struct VFIODirtyRanges {
802 hwaddr min32;
803 hwaddr max32;
804 hwaddr min64;
805 hwaddr max64;
806 hwaddr minpci64;
807 hwaddr maxpci64;
808 } VFIODirtyRanges;
809
810 typedef struct VFIODirtyRangesListener {
811 VFIOContainerBase *bcontainer;
812 VFIODirtyRanges ranges;
813 MemoryListener listener;
814 } VFIODirtyRangesListener;
815
vfio_section_is_vfio_pci(MemoryRegionSection * section,VFIOContainerBase * bcontainer)816 static bool vfio_section_is_vfio_pci(MemoryRegionSection *section,
817 VFIOContainerBase *bcontainer)
818 {
819 VFIOPCIDevice *pcidev;
820 VFIODevice *vbasedev;
821 Object *owner;
822
823 owner = memory_region_owner(section->mr);
824
825 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
826 if (vbasedev->type != VFIO_DEVICE_TYPE_PCI) {
827 continue;
828 }
829 pcidev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
830 if (OBJECT(pcidev) == owner) {
831 return true;
832 }
833 }
834
835 return false;
836 }
837
vfio_dirty_tracking_update_range(VFIODirtyRanges * range,hwaddr iova,hwaddr end,bool update_pci)838 static void vfio_dirty_tracking_update_range(VFIODirtyRanges *range,
839 hwaddr iova, hwaddr end,
840 bool update_pci)
841 {
842 hwaddr *min, *max;
843
844 /*
845 * The address space passed to the dirty tracker is reduced to three ranges:
846 * one for 32-bit DMA ranges, one for 64-bit DMA ranges and one for the
847 * PCI 64-bit hole.
848 *
849 * The underlying reports of dirty will query a sub-interval of each of
850 * these ranges.
851 *
852 * The purpose of the three range handling is to handle known cases of big
853 * holes in the address space, like the x86 AMD 1T hole, and firmware (like
854 * OVMF) which may relocate the pci-hole64 to the end of the address space.
855 * The latter would otherwise generate large ranges for tracking, stressing
856 * the limits of supported hardware. The pci-hole32 will always be below 4G
857 * (overlapping or not) so it doesn't need special handling and is part of
858 * the 32-bit range.
859 *
860 * The alternative would be an IOVATree but that has a much bigger runtime
861 * overhead and unnecessary complexity.
862 */
863 if (update_pci && iova >= UINT32_MAX) {
864 min = &range->minpci64;
865 max = &range->maxpci64;
866 } else {
867 min = (end <= UINT32_MAX) ? &range->min32 : &range->min64;
868 max = (end <= UINT32_MAX) ? &range->max32 : &range->max64;
869 }
870 if (*min > iova) {
871 *min = iova;
872 }
873 if (*max < end) {
874 *max = end;
875 }
876
877 trace_vfio_device_dirty_tracking_update(iova, end, *min, *max);
878 }
879
vfio_dirty_tracking_update(MemoryListener * listener,MemoryRegionSection * section)880 static void vfio_dirty_tracking_update(MemoryListener *listener,
881 MemoryRegionSection *section)
882 {
883 VFIODirtyRangesListener *dirty =
884 container_of(listener, VFIODirtyRangesListener, listener);
885 hwaddr iova, end;
886
887 if (!vfio_listener_valid_section(section, "tracking_update") ||
888 !vfio_get_section_iova_range(dirty->bcontainer, section,
889 &iova, &end, NULL)) {
890 return;
891 }
892
893 vfio_dirty_tracking_update_range(&dirty->ranges, iova, end,
894 vfio_section_is_vfio_pci(section, dirty->bcontainer));
895 }
896
897 static const MemoryListener vfio_dirty_tracking_listener = {
898 .name = "vfio-tracking",
899 .region_add = vfio_dirty_tracking_update,
900 };
901
vfio_dirty_tracking_init(VFIOContainerBase * bcontainer,VFIODirtyRanges * ranges)902 static void vfio_dirty_tracking_init(VFIOContainerBase *bcontainer,
903 VFIODirtyRanges *ranges)
904 {
905 VFIODirtyRangesListener dirty;
906
907 memset(&dirty, 0, sizeof(dirty));
908 dirty.ranges.min32 = UINT32_MAX;
909 dirty.ranges.min64 = UINT64_MAX;
910 dirty.ranges.minpci64 = UINT64_MAX;
911 dirty.listener = vfio_dirty_tracking_listener;
912 dirty.bcontainer = bcontainer;
913
914 memory_listener_register(&dirty.listener,
915 bcontainer->space->as);
916
917 *ranges = dirty.ranges;
918
919 /*
920 * The memory listener is synchronous, and used to calculate the range
921 * to dirty tracking. Unregister it after we are done as we are not
922 * interested in any follow-up updates.
923 */
924 memory_listener_unregister(&dirty.listener);
925 }
926
vfio_devices_dma_logging_stop(VFIOContainerBase * bcontainer)927 static void vfio_devices_dma_logging_stop(VFIOContainerBase *bcontainer)
928 {
929 uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature),
930 sizeof(uint64_t))] = {};
931 struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
932 VFIODevice *vbasedev;
933
934 feature->argsz = sizeof(buf);
935 feature->flags = VFIO_DEVICE_FEATURE_SET |
936 VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP;
937
938 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
939 if (!vbasedev->dirty_tracking) {
940 continue;
941 }
942
943 if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
944 warn_report("%s: Failed to stop DMA logging, err %d (%s)",
945 vbasedev->name, -errno, strerror(errno));
946 }
947 vbasedev->dirty_tracking = false;
948 }
949 }
950
951 static struct vfio_device_feature *
vfio_device_feature_dma_logging_start_create(VFIOContainerBase * bcontainer,VFIODirtyRanges * tracking)952 vfio_device_feature_dma_logging_start_create(VFIOContainerBase *bcontainer,
953 VFIODirtyRanges *tracking)
954 {
955 struct vfio_device_feature *feature;
956 size_t feature_size;
957 struct vfio_device_feature_dma_logging_control *control;
958 struct vfio_device_feature_dma_logging_range *ranges;
959
960 feature_size = sizeof(struct vfio_device_feature) +
961 sizeof(struct vfio_device_feature_dma_logging_control);
962 feature = g_try_malloc0(feature_size);
963 if (!feature) {
964 errno = ENOMEM;
965 return NULL;
966 }
967 feature->argsz = feature_size;
968 feature->flags = VFIO_DEVICE_FEATURE_SET |
969 VFIO_DEVICE_FEATURE_DMA_LOGGING_START;
970
971 control = (struct vfio_device_feature_dma_logging_control *)feature->data;
972 control->page_size = qemu_real_host_page_size();
973
974 /*
975 * DMA logging uAPI guarantees to support at least a number of ranges that
976 * fits into a single host kernel base page.
977 */
978 control->num_ranges = !!tracking->max32 + !!tracking->max64 +
979 !!tracking->maxpci64;
980 ranges = g_try_new0(struct vfio_device_feature_dma_logging_range,
981 control->num_ranges);
982 if (!ranges) {
983 g_free(feature);
984 errno = ENOMEM;
985
986 return NULL;
987 }
988
989 control->ranges = (uintptr_t)ranges;
990 if (tracking->max32) {
991 ranges->iova = tracking->min32;
992 ranges->length = (tracking->max32 - tracking->min32) + 1;
993 ranges++;
994 }
995 if (tracking->max64) {
996 ranges->iova = tracking->min64;
997 ranges->length = (tracking->max64 - tracking->min64) + 1;
998 ranges++;
999 }
1000 if (tracking->maxpci64) {
1001 ranges->iova = tracking->minpci64;
1002 ranges->length = (tracking->maxpci64 - tracking->minpci64) + 1;
1003 }
1004
1005 trace_vfio_device_dirty_tracking_start(control->num_ranges,
1006 tracking->min32, tracking->max32,
1007 tracking->min64, tracking->max64,
1008 tracking->minpci64, tracking->maxpci64);
1009
1010 return feature;
1011 }
1012
vfio_device_feature_dma_logging_start_destroy(struct vfio_device_feature * feature)1013 static void vfio_device_feature_dma_logging_start_destroy(
1014 struct vfio_device_feature *feature)
1015 {
1016 struct vfio_device_feature_dma_logging_control *control =
1017 (struct vfio_device_feature_dma_logging_control *)feature->data;
1018 struct vfio_device_feature_dma_logging_range *ranges =
1019 (struct vfio_device_feature_dma_logging_range *)(uintptr_t)control->ranges;
1020
1021 g_free(ranges);
1022 g_free(feature);
1023 }
1024
vfio_devices_dma_logging_start(VFIOContainerBase * bcontainer,Error ** errp)1025 static bool vfio_devices_dma_logging_start(VFIOContainerBase *bcontainer,
1026 Error **errp)
1027 {
1028 struct vfio_device_feature *feature;
1029 VFIODirtyRanges ranges;
1030 VFIODevice *vbasedev;
1031 int ret = 0;
1032
1033 vfio_dirty_tracking_init(bcontainer, &ranges);
1034 feature = vfio_device_feature_dma_logging_start_create(bcontainer,
1035 &ranges);
1036 if (!feature) {
1037 error_setg_errno(errp, errno, "Failed to prepare DMA logging");
1038 return false;
1039 }
1040
1041 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
1042 if (vbasedev->dirty_tracking) {
1043 continue;
1044 }
1045
1046 ret = ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature);
1047 if (ret) {
1048 ret = -errno;
1049 error_setg_errno(errp, errno, "%s: Failed to start DMA logging",
1050 vbasedev->name);
1051 goto out;
1052 }
1053 vbasedev->dirty_tracking = true;
1054 }
1055
1056 out:
1057 if (ret) {
1058 vfio_devices_dma_logging_stop(bcontainer);
1059 }
1060
1061 vfio_device_feature_dma_logging_start_destroy(feature);
1062
1063 return ret == 0;
1064 }
1065
vfio_listener_log_global_start(MemoryListener * listener,Error ** errp)1066 static bool vfio_listener_log_global_start(MemoryListener *listener,
1067 Error **errp)
1068 {
1069 ERRP_GUARD();
1070 VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
1071 listener);
1072 bool ret;
1073
1074 if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
1075 ret = vfio_devices_dma_logging_start(bcontainer, errp);
1076 } else {
1077 ret = vfio_container_set_dirty_page_tracking(bcontainer, true, errp) == 0;
1078 }
1079
1080 if (!ret) {
1081 error_prepend(errp, "vfio: Could not start dirty page tracking - ");
1082 }
1083 return ret;
1084 }
1085
vfio_listener_log_global_stop(MemoryListener * listener)1086 static void vfio_listener_log_global_stop(MemoryListener *listener)
1087 {
1088 VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
1089 listener);
1090 Error *local_err = NULL;
1091 int ret = 0;
1092
1093 if (vfio_devices_all_device_dirty_tracking(bcontainer)) {
1094 vfio_devices_dma_logging_stop(bcontainer);
1095 } else {
1096 ret = vfio_container_set_dirty_page_tracking(bcontainer, false,
1097 &local_err);
1098 }
1099
1100 if (ret) {
1101 error_prepend(&local_err,
1102 "vfio: Could not stop dirty page tracking - ");
1103 error_report_err(local_err);
1104 vfio_set_migration_error(ret);
1105 }
1106 }
1107
vfio_device_dma_logging_report(VFIODevice * vbasedev,hwaddr iova,hwaddr size,void * bitmap)1108 static int vfio_device_dma_logging_report(VFIODevice *vbasedev, hwaddr iova,
1109 hwaddr size, void *bitmap)
1110 {
1111 uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature) +
1112 sizeof(struct vfio_device_feature_dma_logging_report),
1113 sizeof(uint64_t))] = {};
1114 struct vfio_device_feature *feature = (struct vfio_device_feature *)buf;
1115 struct vfio_device_feature_dma_logging_report *report =
1116 (struct vfio_device_feature_dma_logging_report *)feature->data;
1117
1118 report->iova = iova;
1119 report->length = size;
1120 report->page_size = qemu_real_host_page_size();
1121 report->bitmap = (uintptr_t)bitmap;
1122
1123 feature->argsz = sizeof(buf);
1124 feature->flags = VFIO_DEVICE_FEATURE_GET |
1125 VFIO_DEVICE_FEATURE_DMA_LOGGING_REPORT;
1126
1127 if (ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature)) {
1128 return -errno;
1129 }
1130
1131 return 0;
1132 }
1133
vfio_devices_query_dirty_bitmap(const VFIOContainerBase * bcontainer,VFIOBitmap * vbmap,hwaddr iova,hwaddr size,Error ** errp)1134 int vfio_devices_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
1135 VFIOBitmap *vbmap, hwaddr iova, hwaddr size, Error **errp)
1136 {
1137 VFIODevice *vbasedev;
1138 int ret;
1139
1140 QLIST_FOREACH(vbasedev, &bcontainer->device_list, container_next) {
1141 ret = vfio_device_dma_logging_report(vbasedev, iova, size,
1142 vbmap->bitmap);
1143 if (ret) {
1144 error_setg_errno(errp, -ret,
1145 "%s: Failed to get DMA logging report, iova: "
1146 "0x%" HWADDR_PRIx ", size: 0x%" HWADDR_PRIx,
1147 vbasedev->name, iova, size);
1148
1149 return ret;
1150 }
1151 }
1152
1153 return 0;
1154 }
1155
vfio_get_dirty_bitmap(const VFIOContainerBase * bcontainer,uint64_t iova,uint64_t size,ram_addr_t ram_addr,Error ** errp)1156 int vfio_get_dirty_bitmap(const VFIOContainerBase *bcontainer, uint64_t iova,
1157 uint64_t size, ram_addr_t ram_addr, Error **errp)
1158 {
1159 bool all_device_dirty_tracking =
1160 vfio_devices_all_device_dirty_tracking(bcontainer);
1161 uint64_t dirty_pages;
1162 VFIOBitmap vbmap;
1163 int ret;
1164
1165 if (!bcontainer->dirty_pages_supported && !all_device_dirty_tracking) {
1166 cpu_physical_memory_set_dirty_range(ram_addr, size,
1167 tcg_enabled() ? DIRTY_CLIENTS_ALL :
1168 DIRTY_CLIENTS_NOCODE);
1169 return 0;
1170 }
1171
1172 ret = vfio_bitmap_alloc(&vbmap, size);
1173 if (ret) {
1174 error_setg_errno(errp, -ret,
1175 "Failed to allocate dirty tracking bitmap");
1176 return ret;
1177 }
1178
1179 if (all_device_dirty_tracking) {
1180 ret = vfio_devices_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
1181 errp);
1182 } else {
1183 ret = vfio_container_query_dirty_bitmap(bcontainer, &vbmap, iova, size,
1184 errp);
1185 }
1186
1187 if (ret) {
1188 goto out;
1189 }
1190
1191 dirty_pages = cpu_physical_memory_set_dirty_lebitmap(vbmap.bitmap, ram_addr,
1192 vbmap.pages);
1193
1194 trace_vfio_get_dirty_bitmap(iova, size, vbmap.size, ram_addr, dirty_pages);
1195 out:
1196 g_free(vbmap.bitmap);
1197
1198 return ret;
1199 }
1200
1201 typedef struct {
1202 IOMMUNotifier n;
1203 VFIOGuestIOMMU *giommu;
1204 } vfio_giommu_dirty_notifier;
1205
vfio_iommu_map_dirty_notify(IOMMUNotifier * n,IOMMUTLBEntry * iotlb)1206 static void vfio_iommu_map_dirty_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb)
1207 {
1208 vfio_giommu_dirty_notifier *gdn = container_of(n,
1209 vfio_giommu_dirty_notifier, n);
1210 VFIOGuestIOMMU *giommu = gdn->giommu;
1211 VFIOContainerBase *bcontainer = giommu->bcontainer;
1212 hwaddr iova = iotlb->iova + giommu->iommu_offset;
1213 ram_addr_t translated_addr;
1214 Error *local_err = NULL;
1215 int ret = -EINVAL;
1216
1217 trace_vfio_iommu_map_dirty_notify(iova, iova + iotlb->addr_mask);
1218
1219 if (iotlb->target_as != &address_space_memory) {
1220 error_report("Wrong target AS \"%s\", only system memory is allowed",
1221 iotlb->target_as->name ? iotlb->target_as->name : "none");
1222 goto out;
1223 }
1224
1225 rcu_read_lock();
1226 if (!vfio_get_xlat_addr(iotlb, NULL, &translated_addr, NULL, &local_err)) {
1227 error_report_err(local_err);
1228 goto out_unlock;
1229 }
1230
1231 ret = vfio_get_dirty_bitmap(bcontainer, iova, iotlb->addr_mask + 1,
1232 translated_addr, &local_err);
1233 if (ret) {
1234 error_prepend(&local_err,
1235 "vfio_iommu_map_dirty_notify(%p, 0x%"HWADDR_PRIx", "
1236 "0x%"HWADDR_PRIx") failed - ", bcontainer, iova,
1237 iotlb->addr_mask + 1);
1238 error_report_err(local_err);
1239 }
1240
1241 out_unlock:
1242 rcu_read_unlock();
1243
1244 out:
1245 if (ret) {
1246 vfio_set_migration_error(ret);
1247 }
1248 }
1249
vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection * section,void * opaque)1250 static int vfio_ram_discard_get_dirty_bitmap(MemoryRegionSection *section,
1251 void *opaque)
1252 {
1253 const hwaddr size = int128_get64(section->size);
1254 const hwaddr iova = section->offset_within_address_space;
1255 const ram_addr_t ram_addr = memory_region_get_ram_addr(section->mr) +
1256 section->offset_within_region;
1257 VFIORamDiscardListener *vrdl = opaque;
1258 Error *local_err = NULL;
1259 int ret;
1260
1261 /*
1262 * Sync the whole mapped region (spanning multiple individual mappings)
1263 * in one go.
1264 */
1265 ret = vfio_get_dirty_bitmap(vrdl->bcontainer, iova, size, ram_addr,
1266 &local_err);
1267 if (ret) {
1268 error_report_err(local_err);
1269 }
1270 return ret;
1271 }
1272
1273 static int
vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainerBase * bcontainer,MemoryRegionSection * section)1274 vfio_sync_ram_discard_listener_dirty_bitmap(VFIOContainerBase *bcontainer,
1275 MemoryRegionSection *section)
1276 {
1277 RamDiscardManager *rdm = memory_region_get_ram_discard_manager(section->mr);
1278 VFIORamDiscardListener *vrdl = NULL;
1279
1280 QLIST_FOREACH(vrdl, &bcontainer->vrdl_list, next) {
1281 if (vrdl->mr == section->mr &&
1282 vrdl->offset_within_address_space ==
1283 section->offset_within_address_space) {
1284 break;
1285 }
1286 }
1287
1288 if (!vrdl) {
1289 hw_error("vfio: Trying to sync missing RAM discard listener");
1290 }
1291
1292 /*
1293 * We only want/can synchronize the bitmap for actually mapped parts -
1294 * which correspond to populated parts. Replay all populated parts.
1295 */
1296 return ram_discard_manager_replay_populated(rdm, section,
1297 vfio_ram_discard_get_dirty_bitmap,
1298 &vrdl);
1299 }
1300
vfio_sync_iommu_dirty_bitmap(VFIOContainerBase * bcontainer,MemoryRegionSection * section)1301 static int vfio_sync_iommu_dirty_bitmap(VFIOContainerBase *bcontainer,
1302 MemoryRegionSection *section)
1303 {
1304 VFIOGuestIOMMU *giommu;
1305 bool found = false;
1306 Int128 llend;
1307 vfio_giommu_dirty_notifier gdn;
1308 int idx;
1309
1310 QLIST_FOREACH(giommu, &bcontainer->giommu_list, giommu_next) {
1311 if (MEMORY_REGION(giommu->iommu_mr) == section->mr &&
1312 giommu->n.start == section->offset_within_region) {
1313 found = true;
1314 break;
1315 }
1316 }
1317
1318 if (!found) {
1319 return 0;
1320 }
1321
1322 gdn.giommu = giommu;
1323 idx = memory_region_iommu_attrs_to_index(giommu->iommu_mr,
1324 MEMTXATTRS_UNSPECIFIED);
1325
1326 llend = int128_add(int128_make64(section->offset_within_region),
1327 section->size);
1328 llend = int128_sub(llend, int128_one());
1329
1330 iommu_notifier_init(&gdn.n, vfio_iommu_map_dirty_notify, IOMMU_NOTIFIER_MAP,
1331 section->offset_within_region, int128_get64(llend),
1332 idx);
1333 memory_region_iommu_replay(giommu->iommu_mr, &gdn.n);
1334
1335 return 0;
1336 }
1337
vfio_sync_dirty_bitmap(VFIOContainerBase * bcontainer,MemoryRegionSection * section,Error ** errp)1338 static int vfio_sync_dirty_bitmap(VFIOContainerBase *bcontainer,
1339 MemoryRegionSection *section, Error **errp)
1340 {
1341 ram_addr_t ram_addr;
1342
1343 if (memory_region_is_iommu(section->mr)) {
1344 return vfio_sync_iommu_dirty_bitmap(bcontainer, section);
1345 } else if (memory_region_has_ram_discard_manager(section->mr)) {
1346 int ret;
1347
1348 ret = vfio_sync_ram_discard_listener_dirty_bitmap(bcontainer, section);
1349 if (ret) {
1350 error_setg(errp,
1351 "Failed to sync dirty bitmap with RAM discard listener");
1352 }
1353 return ret;
1354 }
1355
1356 ram_addr = memory_region_get_ram_addr(section->mr) +
1357 section->offset_within_region;
1358
1359 return vfio_get_dirty_bitmap(bcontainer,
1360 REAL_HOST_PAGE_ALIGN(section->offset_within_address_space),
1361 int128_get64(section->size), ram_addr, errp);
1362 }
1363
vfio_listener_log_sync(MemoryListener * listener,MemoryRegionSection * section)1364 static void vfio_listener_log_sync(MemoryListener *listener,
1365 MemoryRegionSection *section)
1366 {
1367 VFIOContainerBase *bcontainer = container_of(listener, VFIOContainerBase,
1368 listener);
1369 int ret;
1370 Error *local_err = NULL;
1371
1372 if (vfio_listener_skipped_section(section)) {
1373 return;
1374 }
1375
1376 if (vfio_devices_all_dirty_tracking(bcontainer)) {
1377 ret = vfio_sync_dirty_bitmap(bcontainer, section, &local_err);
1378 if (ret) {
1379 error_report_err(local_err);
1380 vfio_set_migration_error(ret);
1381 }
1382 }
1383 }
1384
1385 const MemoryListener vfio_memory_listener = {
1386 .name = "vfio",
1387 .region_add = vfio_listener_region_add,
1388 .region_del = vfio_listener_region_del,
1389 .log_global_start = vfio_listener_log_global_start,
1390 .log_global_stop = vfio_listener_log_global_stop,
1391 .log_sync = vfio_listener_log_sync,
1392 };
1393
vfio_reset_handler(void * opaque)1394 void vfio_reset_handler(void *opaque)
1395 {
1396 VFIODevice *vbasedev;
1397
1398 QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
1399 if (vbasedev->dev->realized) {
1400 vbasedev->ops->vfio_compute_needs_reset(vbasedev);
1401 }
1402 }
1403
1404 QLIST_FOREACH(vbasedev, &vfio_device_list, global_next) {
1405 if (vbasedev->dev->realized && vbasedev->needs_reset) {
1406 vbasedev->ops->vfio_hot_reset_multi(vbasedev);
1407 }
1408 }
1409 }
1410
vfio_kvm_device_add_fd(int fd,Error ** errp)1411 int vfio_kvm_device_add_fd(int fd, Error **errp)
1412 {
1413 #ifdef CONFIG_KVM
1414 struct kvm_device_attr attr = {
1415 .group = KVM_DEV_VFIO_FILE,
1416 .attr = KVM_DEV_VFIO_FILE_ADD,
1417 .addr = (uint64_t)(unsigned long)&fd,
1418 };
1419
1420 if (!kvm_enabled()) {
1421 return 0;
1422 }
1423
1424 if (vfio_kvm_device_fd < 0) {
1425 struct kvm_create_device cd = {
1426 .type = KVM_DEV_TYPE_VFIO,
1427 };
1428
1429 if (kvm_vm_ioctl(kvm_state, KVM_CREATE_DEVICE, &cd)) {
1430 error_setg_errno(errp, errno, "Failed to create KVM VFIO device");
1431 return -errno;
1432 }
1433
1434 vfio_kvm_device_fd = cd.fd;
1435 }
1436
1437 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1438 error_setg_errno(errp, errno, "Failed to add fd %d to KVM VFIO device",
1439 fd);
1440 return -errno;
1441 }
1442 #endif
1443 return 0;
1444 }
1445
vfio_kvm_device_del_fd(int fd,Error ** errp)1446 int vfio_kvm_device_del_fd(int fd, Error **errp)
1447 {
1448 #ifdef CONFIG_KVM
1449 struct kvm_device_attr attr = {
1450 .group = KVM_DEV_VFIO_FILE,
1451 .attr = KVM_DEV_VFIO_FILE_DEL,
1452 .addr = (uint64_t)(unsigned long)&fd,
1453 };
1454
1455 if (vfio_kvm_device_fd < 0) {
1456 error_setg(errp, "KVM VFIO device isn't created yet");
1457 return -EINVAL;
1458 }
1459
1460 if (ioctl(vfio_kvm_device_fd, KVM_SET_DEVICE_ATTR, &attr)) {
1461 error_setg_errno(errp, errno,
1462 "Failed to remove fd %d from KVM VFIO device", fd);
1463 return -errno;
1464 }
1465 #endif
1466 return 0;
1467 }
1468
vfio_get_address_space(AddressSpace * as)1469 VFIOAddressSpace *vfio_get_address_space(AddressSpace *as)
1470 {
1471 VFIOAddressSpace *space;
1472
1473 QLIST_FOREACH(space, &vfio_address_spaces, list) {
1474 if (space->as == as) {
1475 return space;
1476 }
1477 }
1478
1479 /* No suitable VFIOAddressSpace, create a new one */
1480 space = g_malloc0(sizeof(*space));
1481 space->as = as;
1482 QLIST_INIT(&space->containers);
1483
1484 if (QLIST_EMPTY(&vfio_address_spaces)) {
1485 qemu_register_reset(vfio_reset_handler, NULL);
1486 }
1487
1488 QLIST_INSERT_HEAD(&vfio_address_spaces, space, list);
1489
1490 return space;
1491 }
1492
vfio_put_address_space(VFIOAddressSpace * space)1493 void vfio_put_address_space(VFIOAddressSpace *space)
1494 {
1495 if (!QLIST_EMPTY(&space->containers)) {
1496 return;
1497 }
1498
1499 QLIST_REMOVE(space, list);
1500 g_free(space);
1501
1502 if (QLIST_EMPTY(&vfio_address_spaces)) {
1503 qemu_unregister_reset(vfio_reset_handler, NULL);
1504 }
1505 }
1506
vfio_address_space_insert(VFIOAddressSpace * space,VFIOContainerBase * bcontainer)1507 void vfio_address_space_insert(VFIOAddressSpace *space,
1508 VFIOContainerBase *bcontainer)
1509 {
1510 QLIST_INSERT_HEAD(&space->containers, bcontainer, next);
1511 bcontainer->space = space;
1512 }
1513
vfio_get_device_info(int fd)1514 struct vfio_device_info *vfio_get_device_info(int fd)
1515 {
1516 struct vfio_device_info *info;
1517 uint32_t argsz = sizeof(*info);
1518
1519 info = g_malloc0(argsz);
1520
1521 retry:
1522 info->argsz = argsz;
1523
1524 if (ioctl(fd, VFIO_DEVICE_GET_INFO, info)) {
1525 g_free(info);
1526 return NULL;
1527 }
1528
1529 if (info->argsz > argsz) {
1530 argsz = info->argsz;
1531 info = g_realloc(info, argsz);
1532 goto retry;
1533 }
1534
1535 return info;
1536 }
1537
vfio_attach_device(char * name,VFIODevice * vbasedev,AddressSpace * as,Error ** errp)1538 bool vfio_attach_device(char *name, VFIODevice *vbasedev,
1539 AddressSpace *as, Error **errp)
1540 {
1541 const VFIOIOMMUClass *ops =
1542 VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_LEGACY));
1543 HostIOMMUDevice *hiod = NULL;
1544
1545 if (vbasedev->iommufd) {
1546 ops = VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_IOMMUFD));
1547 }
1548
1549 assert(ops);
1550
1551
1552 if (!vbasedev->mdev) {
1553 hiod = HOST_IOMMU_DEVICE(object_new(ops->hiod_typename));
1554 vbasedev->hiod = hiod;
1555 }
1556
1557 if (!ops->attach_device(name, vbasedev, as, errp)) {
1558 object_unref(hiod);
1559 vbasedev->hiod = NULL;
1560 return false;
1561 }
1562
1563 return true;
1564 }
1565
vfio_detach_device(VFIODevice * vbasedev)1566 void vfio_detach_device(VFIODevice *vbasedev)
1567 {
1568 if (!vbasedev->bcontainer) {
1569 return;
1570 }
1571 object_unref(vbasedev->hiod);
1572 VFIO_IOMMU_GET_CLASS(vbasedev->bcontainer)->detach_device(vbasedev);
1573 }
1574